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D long serrated spine over rear of eye, not foldmale: D - long front rays; tail base - patch bristlespelvic spine flexible, small flap
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D: long serrated spine over front eye, folds into deep groovepelvic spine in inflexible scaly casing
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D: long serrated spine over rear of eye, not foldableD - no long rays
tail base - 2-4 pr large spinespelvic spine flexible, large flap